下设预防费用、鉴定费用、内部损失、外部损失4个二级科目。

Under the costs of prevention, appraisal cost, internal loss, external loss 4 two subjects.

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因此，在分析不良质量成本时，尤其是外部损失成本，应考虑其无形损失。

Therefore, in the analysis of the cost of poor quality, especially the external cost, should consider its intangible loss.

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质量成本是指将产品质量保持在规定的水平上所需的费用，它包括预防成本、鉴定成本、内部损失成本和外部损失成本。

Quality cost is the cost which is needed to keep product quality at the given level, it includes prevention cost, appraisal cost, internal losing cost and external losing cost.

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